Question

A step up transformer operates on a 230 V line and supplies a current of 2 ampere. The ratio of primary and secondary winding is 1:25 . The current in primary is(a) 25 A(b) 50 A(c) 15 A(d) 12.5 A

Answer 1

Answer:

50A

Explanation:

Voltage = 230V (Given)

Ratio = 1:25 (Given)

For an ideal transformer, the ratio of secondary winding to primary winding is equal to the ratio of primary current to the secondary ratio. Thus,

Ep/Es = Np/Ns = 1/25

Es = 5750V

Is = 2amp and Ps = 2×5750

Ip = Pp/Vp = Ps/Vp

Ip = 2×5750/230

Ip = 11,500/230

= 50

Thus, the current in primary transformer is 50A